231551345403400 has 192 divisors, whose sum is σ = 593443511559360. Its totient is φ = 83319736320000.

The previous prime is 231551345403361. The next prime is 231551345403409. The reversal of 231551345403400 is 4304543155132.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (231551345403409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1459790095 + ... + 1459948705.

It is an arithmetic number, because the mean of its divisors is an integer number (3090851622705).

Almost surely, 2^{231551345403400} is an apocalyptic number.

231551345403400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231551345403400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296721755779680).

231551345403400 is an abundant number, since it is smaller than the sum of its proper divisors (361892166155960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231551345403400 is a wasteful number, since it uses less digits than its factorization.

231551345403400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165576 (or 165567 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 231551345403400 its reverse (4304543155132), we get a palindrome (235855888558532).

The spelling of 231551345403400 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, three hundred forty-five million, four hundred three thousand, four hundred".